Summer Glau has been on so many cancelled shows because she gets hired on so many shows.

She only gets hired on so many shows because her shows keep getting cancelled, freeing her up to be hired on other shows.

And there are many, many actors you could say the exact same thing about. Most shows get cancelled. That is the norm, not the exception. There are far, far more short-lived TV series than long-lived ones.

Yeah, I know. But you could detect my tone of jest, surely? I wasn't actually arguing with your point.